Ascaroth_Prime
Y/N L/N had everything he could have wanted in the supernatural world, a place within Rias Gremory's peerage, incredible power, and the affection of several women who had fallen for him.
But jealousy can turn even an ally into an enemy, and when Issei Hyoudou's growing obsession finally reaches its breaking point, Y/N is betrayed and murdered with the very sword that had once been entrusted to Issei.
His life should have ended there, but fate gives him another beginning in a futuristic world of 2119, where magic does not exist and humanity has created the revolutionary full-dive MMORPG, Otherworld of Yggdrasil.
Reborn into this world, Y/N spends eighteen years building a new life, including six years mastering OoY and becoming something far beyond what he once was.
When the game finally reaches its end, however, reality itself changes, and Y/N finds himself returned to the world where he died, only two months after his murder.
Now possessing everything he gained from another lifetime, Y/N remains hidden as he observes the world he once knew, discovers what happened after his death, and decides what he will do about the people who mourned him... and the man who betrayed him.